The 580 ha field located in the eastern region

     The  present study was to evaluate the spatialvariability of soil salinity .This variability was used in the frame of anon-parametric geostatistical interpolation method in order to assess the riskthat the soil salinity, at un sampled locations, is higher than a giventhreshold.         A study on a 580 ha fieldlocated in the eastern region of Abadla, Sud-West of Algeria, was undertaken toinvestigate the spatial variability of selected soil properties, electricalconductivity ‘EC’, pH (acidity or alkalinity of soil) and soil texture  238 soil samples were taken fromirrigated fields in October 2016, the study consists of a study ofphysicochemical parameters over a horizon of depth of 0.60 cm (the root layer),in this perspective we see very (EC, pH, Na, Ca, Mg, SAR and ESP analyzes) andwere carried out on these samples.   Thestatistical analysis showed high spatial variability across the experimentalfield based on EC, exchangeable sodium potassium and pH; indicated by values ofthe coefficient of variation and (CV) ,of 84 %, 89,52% , 11.16%, and standarddeviation (SD ) of 37.58,1.08 and 0.

0837 respectively.As regards thealkaline soil we can use the  ESP and thePH to describe the degree of alkalinity with limit of IT. soils with gravealkalinity are the ones of which the average ESP is upper to 20 %. In themajority of the cases, the ESP is between 5-20 % ( Modern Alkalinity) is to smoldera large surface.     From data from a systematicsampling with a step of 200 meters, we have attempted to represented thevariation in salinity, ESP and soil pH in mapping form nevertheless the mapsobtained are accurate. The geostatistical analysis included a major step: Theuse of a spatial prediction technique taking into account this spatialstructure ( the Kriging). In the first place, it seems appropriate to firstdetermine whether the overall variability within our study area is importantbefore deciding whether it is useful to analyze the spatial structure, usingsimple tools (histogram, statistical parameter). Variability exists and she isvery important.

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